scsi: Implement get_blk() function

Add a function to obtain the block device for SCSI.

Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Acked-by: Casey Connolly <casey.connolly@linaro.org>

diff --git a/drivers/scsi/scsi-uclass.c b/drivers/scsi/scsi-uclass.c
index 1ee8236c05c8fba244371ae32788e7d9b5b69b9d..3eb6069649feea75a6a6e2681f07b3085c3aca3a 100644 (file)
--- a/drivers/scsi/scsi-uclass.c
+++ b/drivers/scsi/scsi-uclass.c
@@ -10,7 +10,9 @@
 
 #define LOG_CATEGORY UCLASS_SCSI
 
+#include <blk.h>
 #include <dm.h>
+#include <part.h>
 #include <scsi.h>
 
 int scsi_exec(struct udevice *dev, struct scsi_cmd *pccb)
@@ -23,6 +25,34 @@ int scsi_exec(struct udevice *dev, struct scsi_cmd *pccb)
        return ops->exec(dev, pccb);
 }
 
+int scsi_get_blk_by_uuid(const char *uuid,
+                        struct blk_desc **blk_desc_ptr,
+                        struct disk_partition *part_info_ptr)
+{
+       static int is_scsi_scanned;
+       struct blk_desc *blk;
+       int i, ret;
+
+       if (!is_scsi_scanned) {
+               scsi_scan(false /* no verbose */);
+               is_scsi_scanned = 1;
+       }
+
+       for (i = 0; i < blk_find_max_devnum(UCLASS_SCSI) + 1; i++) {
+               ret = blk_get_desc(UCLASS_SCSI, i, &blk);
+               if (ret)
+                       continue;
+
+               ret = part_get_info_by_uuid(blk, uuid, part_info_ptr);
+               if (ret > 0) {
+                       *blk_desc_ptr = blk;
+                       return 0;
+               }
+       }
+
+       return -1;
+}
+
 int scsi_bus_reset(struct udevice *dev)
 {
        struct scsi_ops *ops = scsi_get_ops(dev);

diff --git a/include/scsi.h b/include/scsi.h
index ab53b47b58fac29aba616375c016ffdd494b2dab..8d6c5116419370cccd2a76d4cc3af6cfbede7fe7 100644 (file)
--- a/include/scsi.h
+++ b/include/scsi.h
@@ -351,6 +351,16 @@ int scsi_scan(bool verbose);
  */
 int scsi_scan_dev(struct udevice *dev, bool verbose);
 
+/**
+ * scsi_get_blk_by_uuid() - Provides SCSI partition information.
+ *
+ * @uuid:              UUID of the partition for fetching its info
+ * @blk_desc_ptr:      Provides the blk descriptor
+ * @part_info_ptr:     Provides partition info
+ */
+int scsi_get_blk_by_uuid(const char *uuid, struct blk_desc **blk_desc_ptr,
+                        struct disk_partition *part_info_ptr);
+
 #define SCSI_IDENTIFY                                  0xC0  /* not used */
 
 /* Hardware errors  */